Fitment

Compatible with Volkswagen diesel vehicles equipped with 2.0 TDI engines and SCR (Selective Catalytic Reduction) emission systems.

This part number is used in Volkswagen Group diesel exhaust aftertreatment systems for nitrogen oxide (NOx) monitoring and emission control.

• 04L907805ER
• Volkswagen 2.0 TDI EA288 diesel engine applications
• SCR / AdBlue diesel emission systems
• Fitment varies by model year and ECU calibration (common on VW Passat / Golf / Tiguan diesel variants depending on configuration)

Technical Description

This NOx sensor is installed in the diesel exhaust system to measure nitrogen oxide concentration in exhaust gases.

It sends real-time data to the engine control unit (ECU) to regulate SCR system dosing and support emissions compliance in diesel aftertreatment systems.

The sensor is typically mounted before or after the SCR catalyst depending on vehicle configuration.

Symptoms / Fault Codes

Common symptoms of a failing NOx sensor may include:

• Check engine light
• P2200 / P229F fault codes (system dependent)
• SCR / AdBlue system warning
• Reduced engine power / limp mode
• Increased emissions

OE / Part Numbers

• 04L907805ER
• Related family: 04L907805 series (fitment must be VIN verified)

FAQ

What does a NOx sensor do?

It measures nitrogen oxide levels in diesel exhaust systems and sends data to the ECU for SCR emission control.

Where is it used?

It is used in Volkswagen 2.0 TDI diesel engines with SCR/AdBlue systems to monitor exhaust gases in real time.

Is 04L907805ER interchangeable with other 04L907805 variants?

Not necessarily. Even within the same family, differences in software calibration and sensor revision mean exact OE matching is required.

What happens if it fails?

It may trigger emission warnings, fault codes, and reduced engine performance depending on ECU strategy.